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Kourtney Kardashian Takes a 'Siesta' in a Bikini After Wild Birthday Festivities

It seems Kourtney Kardashian's wild night has finally caught up with her.

The 38-year-old reality star took to Instagram on Tuesday to share a pic of her mid-day "siesta" -- which included Kourtney's taned, toned bod and a hint of underboob.

WATCH: Kim and Kourtney Kardashian Rock Colorful Bikinis During Beach Day With Gal Pals -- See the Pics

The mother of three and her gal pals definitely deserve a little R&R after their crazy birthday festivities in Tulum, Mexico, which according to Kourtney's sister, Kim, included skinny dipping, "special" brownies, nipple clamps, twerking, naked cartwheels, a giant inflatable penis and Kourtney throwing up "in her bed four times."

V I E W S 🔥🍑

A post shared by Kourtney Kardashian Snapchat (@kourtneysnapchat) on Apr 24, 2017 at 3:56pm PDT

Birthday 🎉🎉

A post shared by Kourtney Kardashian Snapchat (@kourtneysnapchat) on Apr 25, 2017 at 2:02pm PDT

Twerk it ✔️

A post shared by Kourtney Kardashian Snapchat (@kourtneysnapchat) on Apr 25, 2017 at 4:05pm PDT

WATCH: Kourtney Kardashian Celebrates Turning 38 in Her 'Birthday Suit' -- See the NSFW Pool Pic!

See more on the eventful vacay in the video below.

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